1) We use prepositions to change the place of the object or subject in space.

1) At/In/On:

“At” for the placement in space:

• At the top of the page, you will find the title of the lesson.
• Let’s meet at the bus stop at 10 o’clock.
• We had a great time at the football match!

Pay attention!

• At the imaginary dot in space, but at imaginary home/organization.
• At home, we usually take a rest, but at university, we always study hard.
• At work, we always do our best, but at school, we just learn how to study.

“In” for the placement inside some room or closed space:

• I found my key in my son’s room.
• We waited half an hour in that queue!
• Don’t spend too much time in the water.
• Let’s have a walk in the park!
• You will find him in bed; he doesn’t feel good.
• Isn’t that robber in prison now?

“On” for on top of something or on the surface:

• Honey, I am afraid we still have some debris on the floor.
• There is an insect on the ceiling!
• We will put his paintings on the wall in the sitting-room.
• Paris is on the river Seine.
• Do your parents work on a farm?

2) We also use prepositions to speak about time.

2) At/ during / for / in / on /while:

“At” for the time:

• The play starts at 9 o’clock.

“On” for the date:

• We will have a lot of food on New Year’s Eve.
• They will not go to France on 16 February.
• On Sunday I always go to the gym.

“In” for a period of time:

• Jim was working for our company in 1990s.
• You will learn English in one month!

“For” when we need to describe for how long an action happens:

• We have been in Paris for two months.

“During” to say when an action happens (with the noun or the object):

• She started snoring during the play!

“While” to say when an action happens (with the subject and the verb):

• While he was at my place, someone called him.